On-Chip Phase Noise Measurement Circuit for RF Systems
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Solution Overview
Problem
Existing electronic circuits in RF/HF electronics face challenges in measuring phase noise due to the need for external connection lines, which introduce signal dispersion and require bulky, costly measurement systems, making it difficult to accurately assess phase noise, especially at high frequencies used in mobile communications systems.
Innovation Solution
The integration of a phase noise measuring device within the electronic circuit on a chip, allowing for automated and regular measurements by using a power splitter, mixer, and low-noise amplifier, and optionally including a digital signal processor to analyze and store phase noise data, thereby reducing the size and cost of measurement systems and minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If external connection lines are used to access circuit elements for measurement, then measurement capability is provided, but signal dispersion is introduced and system size increases
Solution Approach 1:
The patent merges the measurement device with the electronic circuit by integrating both on the same chip. The phase noise measuring device shares the chip substrate with the circuit under test, eliminating the need for external connection lines and thereby preventing signal dispersion while maintaining measurement capability
Solution Approach 2:
The patent introduces an intermediary approach by using the chip substrate itself as the connection medium between the circuit element and measurement device, replacing traditional external wires. This intermediary solution maintains electrical connection while minimizing signal degradation
2Difficulty of detecting and measuring
If conventional external measuring systems are used, then phase noise can be measured, but system size and cost increase
Solution Approach 1:
The patent combines the measurement device and the electronic circuit under test into a single integrated system on one chip. This merging eliminates the need for separate external measuring equipment, dramatically reducing system size while maintaining full measurement functionality
Solution Approach 2:
The integrated measuring device can measure multiple parameters including phase noise, frequency, and other circuit characteristics. This multi-functionality replaces the need for multiple specialized external instruments, reducing overall system size and cost
3Ease of operation
If additional connection lines are provided for measurement, then measurement access is enabled, but interference with circuit operation increases
Solution Approach 1:
By integrating the measurement device on the same chip, the patent eliminates external connection lines that would otherwise interfere with circuit operation. The measurement is performed through integrated pathways that minimize disruption to the circuit's normal functioning
Solution Approach 2:
The circuit performs self-measurement through the integrated device, eliminating the need for external probing that would require additional connections and potentially interfere with operation. The system measures itself without external assistance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables efficient, automated, and cost-effective phase noise measurements within the electronic circuit, reducing measurement time and minimizing interference, allowing for better characterization of oscillating and resonant devices during non-communicating intervals using existing components in the circuit.
Implementation Method 1
a power splitter circuit (152) to split said first signal into two identical signals
Implementation Method 2
a mixer circuit (155) to combine said third and fourth signals to produce a sixth signal
Implementation Method 3
a low-pass filter (156) to eliminate a residue of a high frequency component of said sixth signal to generate a seventh signal
Implementation Method 4
a low-noise, high-gain amplifier (157) connected in series after said low-pass filter (156), which delivers an amplified output signal (X)
Data Source
AI summary
An electronic circuit includes several (at least two) oscillating and/or resonant devices. The circuit uses a measuring device to measure the phase noise of one of the two oscillating/resonant devices. This measuring device is integrated on a chip on which the oscillating/resonant device to be measured is also integrated. The circuits and methods described find application in the area of radiofrequency/high frequency electronics RF/HF, in particular adapted to general public applications in mobile communication systems and/or to metrology.